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Lignumvitae Key Botanical State Park is a Florida State Park located on 280-acre (1 km2) Lignumvitae Key, one mile west of U.S. 1 (Overseas Highway) at mile marker 78.5, and can be reached only by private boat or tour boat. The park was also added to the National Register of Historic Places on February 16, 1999, under the designation of Lignumvitae Key Archeological and Historical District. According to the National Register, it contains 3 historic buildings, 3 structures and 8 objects.